Fire up your metabolism with intervals.

Fire up your metabolism with intervals.

One study found that doing 10 four-minute speed bursts with two minutes of slow walking or cycling after each (60 minutes total) three times a week upped the body’s ability to use fat as fuel during exercise by 25 percent after six weeks. ‘Shoot for an eight or nine on an intensity scale of one to 10, where 10 is an all-out sprint,’ says lead researcher Christopher Perry, PhD, an exercise physiologist at the University of Guelph in Canada.

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